People either check email all the time, or barely at all

According to this chart from Statista, based on stats from
email marketing company BlueHornet, almost 34% of American
consumers say they check their email "throughout the day." Mobile
is a huge reason for this: The same survey found that
consumers look at their phone more than 150 times a day, on
average.

But if you're not checking email constantly, you're probably
barely checking at all — the biggest group (39%) was people who
check their email only 1 to 3 times a day. Statista